EP2981327A1 - Atraumatic modiolar hugging electrode - Google Patents
Atraumatic modiolar hugging electrodeInfo
- Publication number
- EP2981327A1 EP2981327A1 EP14780240.9A EP14780240A EP2981327A1 EP 2981327 A1 EP2981327 A1 EP 2981327A1 EP 14780240 A EP14780240 A EP 14780240A EP 2981327 A1 EP2981327 A1 EP 2981327A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- electrode
- active base
- passive
- scala tympani
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0526—Head electrodes
- A61N1/0541—Cochlear electrodes
Definitions
- the present invention relates to an implantable electrode arrangement for cochlear implant systems.
- a normal ear transmits sounds as shown in Figure 1 through the outer ear 101 to the tympanic membrane 102 which moves the bones of the middle ear 103 that vibrate the oval window and round window openings of the cochlea 104.
- the cochlea 104 is a long narrow duct wound spirally about its axis for approximately two and a half turns. It includes an upper channel known as the scala vestibuli and a lower channel known as the scala tympani, which are connected by the cochlear duct.
- the cochlea 104 forms an upright spiraling cone with a center called the modiolar where the spiral ganglion cells of the acoustic nerve 113 reside.
- the fluid-filled cochlea 104 functions as a transducer to generate electric pulses which are transmitted to the cochlear nerve 113, and ultimately to the brain.
- Hearing is impaired when there are problems in the ability to transduce external sounds into meaningful action potentials along the neural substrate of the cochlea 104.
- auditory prostheses have been developed.
- a conventional hearing aid may be used to provide acoustic-mechanical stimulation to the auditory system in the form of amplified sound.
- a cochlear implant with an implanted electrode can electrically stimulate auditory nerve tissue with small currents delivered by multiple electrode contacts distributed along the electrode.
- Figure 1 also shows some components of a typical cochlear implant system where an external microphone provides an audio signal input to an external signal processor 111 in which various signal processing schemes can be implemented.
- the processed signal is then converted into a digital data format for transmission by external transmitter coil 107 into the implant 108.
- the implant 108 also performs additional signal processing such as error correction, pulse formation, etc., and produces a stimulation pattern (based on the extracted audio information) that is sent through an electrode lead 109 to an implanted electrode array 110.
- this electrode array 110 includes multiple stimulation contacts 112 on its surface that provide selective stimulation of the cochlea 104.
- the electrode array 110 contains multiple electrode wires embedded in a soft silicone body referred to as the electrode carrier.
- the electrode array 110 needs to be mechanically robust, and yet flexible and of small size to be inserted into the cochlea 104.
- the material of the electrode array 110 needs to be soft and flexible in order to minimize trauma to neural structures of the cochlea 104. But an electrode array 110 that is too floppy tends to buckle too easily so that the electrode array 110 cannot be inserted into the cochlea 104 up to the desired insertion depth.
- CI electrode arrays should be highly flexible in all directions in order to adapt to individual variations in curvature and changes in inclination of the ST for minimal trauma implantation.
- Electrode arrays that lie close to the inner modiolar wall of the cochlear scala tympani are advantageous over the more typical free- fitting electrode arrays that lie against the outer lateral wall in-terms of power consumption and effectiveness in stimulating the spiral ganglion cells of the modiolus.
- Modiolar hugging electrode arrays known in the prior art are often pre-curved and required a positioning stylet for safe introduce it into the cochlea (e.g., U.S. Patent 5,545,219, U.S. Patent 6,125,302, and U.S. Patent 6,374, 143).
- Other existing perimodiolar hugging electrode arrays require some additional structural elements to ensure placement of the electrode array close to the inner modiolar wall after insertion. However, after insertion there is no opportunity for the surgeon to correct and optimize the position of the electrode array.
- U.S. Patent 6,498,954 describes a cochlear implant electrode with a leading section that is attached to the distal end of the electrode array. Two separate
- cochleostomies are drilled, one at the base and another separate one at the apex of the cochlea.
- the electrode leading section then is inserted through the basal cochleostomy and advanced towards the apical cochleostomy.
- a forward end of the leading section is then pulled through the apical cochleostomy which causes the electrode array to be pulled into the cochlea.
- the leading section must be the leading section must relatively stiff in order to properly move the leading section through the interior of the cochlea from base to apex.
- Embodiments of the present invention are directed to a cochlear implant including an active base section with a front surface configured to lie against an inner modiolar wall of the scala tympani. Electrode contacts are on the front surface configured to face the inner modiolar wall to deliver electrode stimulation signals to nearby modiolar neural tissue.
- a passive apex section has a front surface without electrode contacts configured to lie against an outer lateral wall of the scala tympani.
- a U-shape transition bend section is at an apical end of the active base section bending in a reverse direction and transitioning into a basal end of the passive apex section such that the back surface of the passive apex section lies adjacent to a back surface of the active base section when the electrode is implanted in the patient.
- the passive apex section may have a thinner cross-section than the active base section; for example, the cross-section of the passive apex section may be half as thick as the cross-section of the active base section.
- the apical tip of the apex section may be adapted to extend through the electrode opening back to the mastoid bone of the patient.
- the passive apex section may include an interior volume for holding a therapeutic drug which is released by the electrode into the scala tympani over a treatment period of time.
- the apical tip of the apex section may include a fill opening for introducing the therapeutic drug into the interior volume of the passive apex section.
- Embodiments of the present invention also include a method of implanting a cochlear implant electrode.
- An apical tip of a passive apex section of the implant electrode without electrode contacts is anchored at an electrode opening in the cochlea of an implant patient.
- a U-shape transition bend section is formed in the passive apex section that reverses direction of the passive apex section.
- the passive apex section is pushed through the electrode opening to advance the transition bend section into the scala tympani of the cochlea with a front surface of the passive apex section facing against an outer lateral wall of the scala tympani and a back surface of the passive apex section facing a center of the scala tympani.
- the pushing continues to introduce into the scala tympani an active base section of the implant electrode having a back surface facing the center of the scala tympani and a front surface configured to face an inner modiolar wall of the scala tympani, the front surface including electrode contacts for delivering electrode stimulation signals to nearby modiolar neural tissue.
- the process continues until the active base section is completely within the scala tympani with the back surface of the active base section adjacent to a back surface of the passive apex section.
- the passive apex section may have a thinner cross-section than the active base section; for example, the cross-section of the passive apex section may be half as thick as the cross-section of the active base section.
- a surgeon implanting the electrode in the cochlea may actively anchor the apical tip of the apex section at the electrode opening.
- the apical tip may include an anchoring pin adapted to be attached at the electrode opening to anchor the apical tip.
- the apical tip may be anchored to extend back through the electrode opening to the mastoid bone of the patient.
- the method may further include introducing a therapeutic drug into an interior volume of the passive apex section for release by the electrode into the scala tympani over a treatment period of time.
- the method may later include disconnecting the passive apex section from the active base section and removing the passive apex section from the scala tympani.
- Figure 1 shows anatomical structures in a human ear having a cochlear implant system.
- Figure 2 shows an example of an atraumatic modiolar hugging implant electrode according to one embodiment of the present invention.
- Figure 3 A-C illustrates the insertion of such an electrode into the scala tympani of an implant patient.
- Figure 4 A-B illustrates various alternative structural features of an implant electrode according to an embodiment of the present invention.
- Figure 5 shows cross-sections of a scala tympani at various rotational locations within a typical cochlea.
- Figure 6 A-C shows cross-sections of implant electrodes according to embodiments of the present invention.
- Figure 7 shows various alternative structural features of an implant electrode according to an embodiment of the present invention.
- Locating the electrode array close to the modiolar wall is advantageous over conventional free-fitting lateral wall electrode arrays in terms of power consumption and effectiveness in stimulating the spiral ganglion cells.
- Embodiments of the present invention are directed to a novel and inventive electrode array derived from a lateral wall electrode and having an additional passive part that extends out beyond the apical end. The tip of this passive part is held outside the cochlea and a U-shape bend is created as the active part of the electrode array is pushed into the cochlea. Once the electrode array has been fully inserted, the active part naturally lies close to the modiolar wall and the passive part remains close to the lateral wall side.
- Figure 2 shows an example of an atraumatic modiolar hugging implant electrode 200 which includes an active base section 202 with a front surface 206 configured to lie against an inner modiolar wall of the scala tympani and electrode contacts 203 configured to face the inner modiolar wall to deliver electrode stimulation signals to nearby modiolar neural tissue.
- a passive apex section 201 has a front surface 204 without electrode contacts configured to lie against an outer lateral wall of the scala tympani.
- a U-shape transition bend section 210 bends in a reverse direction such that the back surface 205 of the passive apex section 201 lies adjacent to a back surface 207 of the active base section 202 at an electrode opening in the cochlea when the electrode 200 is implanted in the patient.
- the passive apex section 201 is very flexible in comparison to the active base section 202, both of which may be made of an appropriate medical grade silicone elastomer material. Both sections should be of similar length to achieve full insertion of the active base section 202 to have all the electrode contacts 203 within the cochlea.
- Figure 3 A-C illustrates the insertion of such an electrode 200 into the scala tympani 307 of an implant patient.
- the apical tip 208 is anchored at an electrode opening 301 in the cochlea 302 and a U-shape transition bend section 303 is formed in the passive apex section 201 that reverses direction of the passive apex section 201.
- the passive apex section 201 is pushed through the electrode opening 301 to advance the transition bend section 303 into the scala tympani 307 with a front surface 204 of the passive apex section 201 facing against an outer lateral wall 305 of the scala tympani 307 and a back surface 205 of the passive apex section 201 facing a center of the scala tympani 307.
- the pushing continues as shown in Fig.
- FIG. 4 A-B illustrates various alternative structural features of an implant electrode 200 according to an embodiment of the present invention.
- Fig. 4 A shows an anchoring pin 401 at the apical tip 208 which is adapted to be attached at the electrode opening 301 to anchor the apical tip 208 during surgical insertion.
- a surgeon implanting the electrode 200 in the cochlea 302 may actively anchor the apical tip 208 at the electrode opening 301.
- the apical tip 208 may be anchored to extend back through the electrode opening 301 to the mastoid bone 701 of the patient (See Fig.
- FIG. 4B shows an implant electrode 200 having an internal bridge wire 403 that connects at a physical section boundary 402 between the passive apical section 201 and the active base section 202 which allows the two sections to be disconnected to remove the passive apex section 201 from the scala tympani 301 after insertion of the active base section 202.
- Figure 5 shows cross-sections of a scala tympani 307 at various rotational locations within a typical cochlea.
- the variations in size and shape at the medial wall on the left side of each cross-section reflects how the front surface 206 of the active base section 202 must be correspondingly adapted in size and shape to fit properly facing the modiolus as closely as possible.
- Figure 6A shows a cross-section of a scala tympani 307 with an implant electrode according to an embodiment of the present invention where the front surface 206 of the active base section 202 configured to face the inner modiolar wall 306 of the scala tympani 307 with the electrode contacts 203 positioned to deliver electrode stimulation signals to nearby modiolar neural tissue 601 connected to the modiolus nerve 602.
- the front surface 204 of the passive apical section 201 lies against the outer lateral wall 305 of the scala tympani 307 with the back surface 205 facing longitudinal centerline of the scala tympani 207 and the back surface 207 of the active base section 202.
- both the active base section 202 and the passive apical section 201 preferably have an asymmetric form.
- Both front surface 204 and 206 preferably are curved to lie against the adjacent scala wall, while the respective back surface 205 and 207 are preferably planar to lie next to each other.
- Figs. 6 B-C show cross-sections of alternative embodiments wherein the passive apical section 201 includes extended ends 601 that after insertion into the scala tympani 307 act as an electrical shield that minimizes current leakage from the electrode contacts 203 back towards the lateral wall 305.
- the extended ends 601 may be formed of the same electrically insulating silicone material as the main body of the passive apical section 201.
- Figure 7 shows various alternative structural features of an implant electrode according to an embodiment of the present invention which includes an internal drug delivery channel 702 within the passive apex section 201 for release into the scala tympani 307 over a treatment period of time.
- a drug fill opening 703 at the apical end 208 at the mastoid bone 701 allows for surgical filling/re-filling of the drug delivery channel 702.
- the apical tip of the passive apical section can be cut or pushed inside the scala tympani. Or a fascia piece may be inserted between the back surfaces of the two sections at the electrode opening.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14780240T PL2981327T3 (en) | 2013-04-05 | 2014-04-04 | Atraumatic modiolar hugging electrode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361808655P | 2013-04-05 | 2013-04-05 | |
PCT/US2014/032912 WO2014165725A1 (en) | 2013-04-05 | 2014-04-04 | Atraumatic modiolar hugging electrode |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2981327A1 true EP2981327A1 (en) | 2016-02-10 |
EP2981327A4 EP2981327A4 (en) | 2016-11-23 |
EP2981327B1 EP2981327B1 (en) | 2017-09-13 |
Family
ID=51654951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14780240.9A Active EP2981327B1 (en) | 2013-04-05 | 2014-04-04 | Atraumatic modiolar hugging electrode |
Country Status (6)
Country | Link |
---|---|
US (1) | US9572974B2 (en) |
EP (1) | EP2981327B1 (en) |
CN (1) | CN105102058B (en) |
AU (1) | AU2014248043B2 (en) |
PL (1) | PL2981327T3 (en) |
WO (1) | WO2014165725A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11229789B2 (en) | 2013-05-30 | 2022-01-25 | Neurostim Oab, Inc. | Neuro activator with controller |
KR102390107B1 (en) | 2013-05-30 | 2022-04-25 | 그라함 에이치. 크리시 | Topical neurological stimulation |
US11077301B2 (en) | 2015-02-21 | 2021-08-03 | NeurostimOAB, Inc. | Topical nerve stimulator and sensor for bladder control |
US11738193B2 (en) * | 2016-10-28 | 2023-08-29 | Cochlear Limited | Barriers for electrodes |
CA3082390C (en) | 2017-11-07 | 2023-01-31 | Neurostim Oab, Inc. | Non-invasive nerve activator with adaptive circuit |
DE102018118092B4 (en) | 2018-07-26 | 2022-07-14 | Gottfried Wilhelm Leibniz Universität Hannover | Hybrid system with nanoporous nanoparticles in a noble metal structure and method for the production thereof and its use |
CA3144957A1 (en) | 2019-06-26 | 2020-12-30 | Neurostim Technologies Llc | Non-invasive nerve activator with adaptive circuit |
EP4017580A4 (en) | 2019-12-16 | 2023-09-06 | Neurostim Technologies LLC | Non-invasive nerve activator with boosted charge delivery |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997010784A1 (en) * | 1995-09-20 | 1997-03-27 | Cochlear Limited | Bioresorbable polymer use in cochlear and other implants |
US6038484A (en) * | 1997-09-02 | 2000-03-14 | Advanced Bionics Corporation | Cochlear electrode with modiolar-hugging system including a flexible positioner |
US6125302A (en) * | 1997-09-02 | 2000-09-26 | Advanced Bionics Corporation | Precurved modiolar-hugging cochlear electrode |
US6266568B1 (en) * | 1998-06-02 | 2001-07-24 | Advanced Bionics Corporation | Inflatable cochlear electrode array and method of making same |
US6397110B1 (en) * | 1998-08-26 | 2002-05-28 | Advanced Bionics Corporation | Cochlear electrode system including detachable flexible positioner |
US6304787B1 (en) * | 1998-08-26 | 2001-10-16 | Advanced Bionics Corporation | Cochlear electrode array having current-focusing and tissue-treating features |
AU776958B2 (en) * | 1999-05-21 | 2004-09-30 | Cochlear Limited | A cochlear implant electrode array |
US6374143B1 (en) * | 1999-08-18 | 2002-04-16 | Epic Biosonics, Inc. | Modiolar hugging electrode array |
US7319906B2 (en) * | 2002-09-19 | 2008-01-15 | Advanced Bionics Corporation | Cochlear implant electrode and method of making same |
AU2003900773A0 (en) | 2003-02-21 | 2003-03-13 | Cochlear Limited | Telescopic array for a cochlear implant |
WO2009065127A1 (en) * | 2007-11-16 | 2009-05-22 | Cochlear Americas | Electrode array and method of forming an electrode array |
US7720542B2 (en) * | 2006-07-17 | 2010-05-18 | Med-El Elektromedizinische Geraete Gmbh | Remote sensing and actuation of fluid in cranial implants |
EP1972359B1 (en) * | 2007-03-20 | 2015-01-28 | Cochlear Limited | Securing an implanted medical device in a patient |
WO2009062266A1 (en) * | 2007-11-16 | 2009-05-22 | Cochlear Limited | Lead for a cochlear implant |
US8355793B2 (en) | 2009-01-02 | 2013-01-15 | Cochlear Limited | Optical neural stimulating device having a short stimulating assembly |
US20110137393A1 (en) * | 2009-12-03 | 2011-06-09 | Pawsey Nicholas C | Stiffiner having an enlarged bombous distal end region and corresponding cochlear implant stimulating assembly |
US20120158113A1 (en) * | 2010-12-15 | 2012-06-21 | Med-El Elektromedizinische Geraete Gmbh | Rectilinear Electrode Contact For Neural Stimulation |
-
2014
- 2014-04-04 EP EP14780240.9A patent/EP2981327B1/en active Active
- 2014-04-04 PL PL14780240T patent/PL2981327T3/en unknown
- 2014-04-04 AU AU2014248043A patent/AU2014248043B2/en active Active
- 2014-04-04 WO PCT/US2014/032912 patent/WO2014165725A1/en active Application Filing
- 2014-04-04 CN CN201480011402.XA patent/CN105102058B/en active Active
- 2014-04-04 US US14/245,038 patent/US9572974B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
PL2981327T3 (en) | 2018-02-28 |
EP2981327A4 (en) | 2016-11-23 |
US20140303548A1 (en) | 2014-10-09 |
CN105102058A (en) | 2015-11-25 |
AU2014248043B2 (en) | 2016-07-21 |
AU2014248043A1 (en) | 2015-09-10 |
CN105102058B (en) | 2016-11-09 |
WO2014165725A1 (en) | 2014-10-09 |
US9572974B2 (en) | 2017-02-21 |
EP2981327B1 (en) | 2017-09-13 |
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